Define the terms 1) light year.
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light year is the unit in which the time taken by light to travel for one year
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★ Light Year ★
✥ A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). ... For example, the nearest star to our sun, Proxima Centauri, is 4.2 light-years away.
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